AM3874 datasheet(255/361 Pages) TI

255 / 361 page

AM3874, AM3871

www.ti.com

SPRS695C – SEPTEMBER 2011 – REVISED DECEMBER 2013

8.8.2.3

GPMC/NAND Flash and ELM Interface Timing

Table 8-38. Timing Requirements for GPMC/NAND Flash Interface

(see Figure 8-35)

OPP100/120/166

NO.

UNIT

MIN

MAX

tacc(DAT)

Data maximum access time (GPMC_FCLK cycles)

J(1)

cycles

(1)

J = AccessTime * (TimeParaGranularity + 1)

Table 8-39. Switching Characteristics Over Recommended Operating Conditions for GPMC/NAND Flash

Interface

(see Figure 8-33, Figure 8-34, Figure 8-35, Figure 8-36)

OPP100/120/166

NO.

PARAMETER

UNIT

MIN

MAX

tw(nWEV)

Pulse duration, GPMC_WE valid time

A(1)

td(nCSV-nWEV)

Delay time, GPMC_CS[X] valid to GPMC_WE valid

B - 2(2)

B + 4(2)

td(CLEH-nWEV)

Delay time, GPMC_BE0_CLE high to GPMC_WE valid

C - 2(3)

C + 4(3)

td(nWEV-DV)

Delay time, GPMC_D[15:0] valid to GPMC_WE valid

D - 2(4)

D + 4(4)

td(nWEIV-DIV)

Delay time, GPMC_WE invalid to GPMC_AD[15:0] invalid

E - 2(5)

E + 4(5)

td(nWEIV-CLEIV)

Delay time, GPMC_WE invalid to GPMC_BE0_CLE invalid

F - 2(6)

F + 4(6)

td(nWEIV-nCSIV)

Delay time, GPMC_WE invalid to GPMC_CS[X] invalid

G - 2(7)

G + 4(7)

td(ALEH-nWEV)

Delay time, GPMC_ADV_ALE High to GPMC_WE valid

C - 2(3)

C + 4(3)

td(nWEIV-ALEIV)

Delay time, GPMC_WE invalid to GPMC_ADV_ALE invalid

F - 2(6)

F + 4(6)

tc(nWE)

Cycle time, write cycle time

H(8)

td(nCSV-nOEV)

Delay time, GPMC_CS[X] valid to GPMC_OE_RE valid

I - 2(9)

I + 4(9)

tw(nOEV)

Pulse duration, GPMC_OE_RE valid time

K(10)

tc(nOE)

Cycle time, read cycle time

L(11)

td(nOEIV-nCSIV)

Delay time, GPMC_OE_RE invalid to GPMC_CS[X] invalid

M - 2(12)

M + 4(12)

(1)

A = (WEOffTime - WEOnTime) * (TimeParaGranularity + 1) * GPMC_FCLK

(2)

= B + nWE Min Delay - nCS Max Delay

B = ((WEOnTime - CSOnTime) * (TimeParaGranularity + 1) + 0.5 * (WEExtraDelay - CSExtraDelay)) * GPMC_FCLK

(3)

= C + nWE Min Delay - CLE Max Delay

C = ((WEOnTime - ADVOnTime) * (TimeParaGranularity + 1) + 0.5 * (WEExtraDelay - ADVExtraDelay)) * GPMC_FCLK

(4)

= D + nWE Min Delay - Data Max Delay

D = (WEOnTime * (TimeParaGranularity + 1) + 0.5 * WEExtraDelay ) * GPMC_FCLK

(5)

=E + Data Min Delay - nWE Max Delay

E = ((WrCycleTime - WEOffTime) * (TimeParaGranularity + 1) - 0.5 * WEExtraDelay ) * GPMC_FCLK

(6)

= F + CLE Min Delay - nWE Max Delay

F = ((ADVWrOffTime - WEOffTime) * (TimeParaGranularity + 1) + 0.5 * (ADVExtraDelay - WEExtraDelay )) * GPMC_FCLK

(7)

=G + nCS Min Delay - nWE Max Delay

G = ((CSWrOffTime - WEOffTime) * (TimeParaGranularity + 1) + 0.5 * (CSExtraDelay - WEExtraDelay )) * GPMC_FCLK

(8)

H = WrCycleTime * (1 + TimeParaGranularity) * GPMC_FCLK

(9)

= I + nOE Min Delay - nCS Max Delay

I = ((OEOnTime - CSOnTime) * (TimeParaGranularity + 1) + 0.5 * (OEExtraDelay - CSExtraDelay)) * GPMC_FCLK

(10) K = (OEOffTime - OEOnTime) * (1 + TimeParaGranularity) * GPMC_FCLK

(11) L = RdCycleTime * (1 + TimeParaGranularity) * GPMC_FCLK

(12) =M + nCS Min Delay - nOE Max Delay

M = ((CSRdOffTime - OEOffTime) * (TimeParaGranularity + 1) + 0.5 * (CSExtraDelay - OEExtraDelay ))* GPMC_FCLK

Peripheral Information and Timings

255

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